1. 直接写得数。
2000 + 4000 =
4000 - 2000 =
1500 - 500 =
2800 - 600 =
4500 - 4000 =
9000 - 4000 =
3000 + 4000 =
1000 + 2000 =
600 + 2000 =
5100 - 4000 =
7000 - 3000 =
1000 - 1000 =
900 + 600 =
1800 - 900 =
240 - 80 =
4200 + 800 =
6700 - 1200 =
3500 - 600 =
5000 - 3600 =
2900 + 2700 =
8200 + 400 =
2000 + 4000 =
4000 - 2000 =
1500 - 500 =
2800 - 600 =
4500 - 4000 =
9000 - 4000 =
3000 + 4000 =
1000 + 2000 =
600 + 2000 =
5100 - 4000 =
7000 - 3000 =
1000 - 1000 =
900 + 600 =
1800 - 900 =
240 - 80 =
4200 + 800 =
6700 - 1200 =
3500 - 600 =
5000 - 3600 =
2900 + 2700 =
8200 + 400 =
答案:
6000 2000 1000 2200 500 5000 7000 3000 2600 1100 4000 0 1500 900 160 5000 5500 2900 1400 5600 8600
2. 解决问题。
(1)天天家、乐乐家和学校在一条直线上。天天家离学校600米,乐乐家离学校300米,天天家和乐乐家相距多少米?
(2)某剧院有1400个座位,进去了1000名观众,现在还有多少个空座位?
(1)天天家、乐乐家和学校在一条直线上。天天家离学校600米,乐乐家离学校300米,天天家和乐乐家相距多少米?
(2)某剧院有1400个座位,进去了1000名观众,现在还有多少个空座位?
答案:
(1)600 - 300 = 300(米) 或 600 + 300 = 900(米)
(2)1400 - 1000 = 400(个)
(1)600 - 300 = 300(米) 或 600 + 300 = 900(米)
(2)1400 - 1000 = 400(个)
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